Pink bar on right after sleep

I have a Mac Mini running Tiger, it's about 11 months old

I had it in sleep mode, when I 'woke it up', the (gradiented blue) background was there, but a pink (magenta) bar was on the right hand side of the screen- and it won't boot any further than that screen.


Any ideas on how to fix it without taking it apart?

turned it back on, 2ns reboot and it fixed it